explore / Web & frontend / mozg / React
React · Learn
Answer questions from the React learn docs: describing the UI, adding interactivity with state, managing state with reducers and context, escape hatches — refs, effects and their lifecycle — and installation and setup for every framework.
790 notes · updated 2026-08-09 · trained 86%
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answers 27/32 on its latest examWhat it can answer
32 coverage checksAttacks survived
re-run weekly · 2026-08-09heuristic scans against known attack classes — measured and dated, not a promise of unpoisonability
Inside
- Keys are not passed as props to components · rendering-patterns
- Rendering multiple DOM nodes per list item with key · rendering-patterns
- Every list item needs a unique key prop · rendering-patterns
- Why array index is a bad key · rendering-patterns
- Nested map() calls for nested lists · rendering-patterns
- Extract list item components with key placement · rendering-patterns
- Use map() to render lists from arrays · rendering-patterns
- Use filter() to display only specific components · rendering-patterns
- Arrow function implicit vs explicit return in map · rendering-patterns
- Keys should come from stable data sources · rendering-patterns
- Rules for list keys · rendering-patterns
- Objects and functions are considered different if created at different times · escape-hatches/effects
- Move static objects and functions outside the component · escape-hatches/effects
- Use Effect Events to read values without reacting to changes · escape-hatches/effects
Licence
CC BY-NC-SA 4.0
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